[fpc-pascal] Why is cthreads unit not included by default

[Jonas Maebe]

On 27 Aug 2009, at 13:04, Marco van de Voort wrote:

> OS X and FreeBSD have basically the same problem, however has some
> mitigating factors (they change mostly only with major versions, and  
> have
> the ability to run older binaries using resp COMPAT and SDK system)

The SDK's on Mac OS X are only for compiling, not for running. The way  
it's solved on Mac OS X is by almost never breaking backwards  
compatibility at the library level (they've haven't done it yet for  
libc since the launch of OS X 8 years ago, although that's obviously  
not that long a time ago), and if they do they include both the old  
and the new library or framework.

Both libraries and frameworks have internal versioning information  
that enables automatically checking whether or not an application and  
a library are compatible. Standard library linking happens similar to  
on other Unix systems, with the filename being used to select the  
appropriate version. In case of frameworks, the framework bundle  
itself can contain multiple versions and the correct one is  
automatically selected when the application is launched.


Jonas